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find /usr/local/Cellar | grep bin/ > ./usr_bin_local
ruby -ne "s=\$_; p=s.match(/\/bin\/(.+)/); b=p[1] unless p.nil?; cmd=%Q(ln -s #{s.chomp} /usr/local/bin/#{b});`#{cmd}`" ./usr_bin_local

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PostgreSQL Cheatsheet

PSQL main commands

Opening PostgreSQL console:

psql -h <hostname> -U <user> <db> # db is optional

Working with pgsql console

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Disable PostgreSQL EnterpriseDB's Apache server and enable nginx in Mac OS X

Disable PostgreSQL EnterpriseDB's Apache server

sudo launchctl unload /Library/LaunchDaemons/com.edb.launchd.postgresql-x.x.plist
sudo rm -f /Library/LaunchDaemons/com.edb.launchd.postgresql-x.x.plist

Enable nginx, installed through brew

sudo cp /usr/local/opt/nginx/homebrew.mxcl.nginx.plist /Library/LaunchDaemons/

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iTerm2 – Useful Shortcuts (Mac OS X)

with a hat tip to Sublime Text 2 Shortcuts

The Awesome

⌘;	autocomplete
⌘⌥B	instant replay
⌘⌥E	search across all tabs

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# Automatically adds branch name and description to every commit message.
#
DESCRIPTION=$(git config branch."$NAME".description)

if ! [[ $@ == *HEAD* ]] then
  NAME=$(git branch | grep '*' | sed 's/* //')
  echo "$NAME"': '"`cat "$1"`" > "$1"
fi

if [ -n "$DESCRIPTION" ] then

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AllCops:
  RunRailsCops: true

Style/Encoding:
  Enabled: false

Style/AsciiComments:
  Enabled: false

Lint/AssignmentInCondition:

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%Q (executes #{})

This is an alternative for double-quoted strings, when you have more quote characters in a string.Instead of putting backslashes in front of them, you can easily write:

>> %Q(Joe said: "Frank said: "#{what_frank_said}"")
=> "Joe said: "Frank said: "Hello!"""

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class LunchList
  NAMES = %i(DimaS DimaG Denis SergeyStat SergeyAdm Oleg Alena).shuffle
  MIN_EATERS = 3
  MAX_EATERS = 4
  
  def generated_list
    decisions = {}
    NAMES.map do |name| 
      decisions[name] = rand(0..1).zero? ? 'wait' : 'go!'
    end

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  class SessionCookieGenerator
    def self.generate user_obj
      new(user_obj).generate
    end

    def initialize user_obj
      @user = user_obj
      @cookie = {}
      @session = {'rack.session' => {}}
    end

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session_secret = RailsApp::Application.config.secret_token
verifier = ActiveSupport::MessageVerifier.new(session_secret, digest: 'SHA1')
cookie_hash = {
  session_id: SecureRandom.hex(16),
  ctime: Time.now.utc.to_i,
  atime: Time.now.utc.to_i,
  user_id: User.current.id
}
verifier.generate(cookie_hash) # returns cookie value